There have always been the bad boys – and girls — of comedy. Roseanne Arnold — now known as Roseanne Barr — made people think with her ground-breaking sitcom about a blue-collar family, but many winced at her off-stage shenanigans such as her wacky marriage to Tom Arnold and her off-key rendition of the "Star-Spangled Banner" at a San Diego Padres game.

John Belushi was a multi-talented delight on “Saturday Night Live” and in films such as “National Lampoon’s Animal House,” but his genius was drowned by excess. Richard Pryor smashed barriers with his urban wit, but he also lived fast. For a while, his off-stage life was perfect fodder for his routines, but he eventually succumbed to his demons, famously setting himself on fire during a crack-fueled bender that left him running in flames from his San Fernando Valley home.